package com.longe.security;

import org.apache.shiro.web.servlet.ShiroHttpServletRequest;
import org.apache.shiro.web.session.mgt.DefaultWebSessionManager;
import org.apache.shiro.web.util.WebUtils;
import org.springframework.util.StringUtils;

import javax.servlet.ServletRequest;
import javax.servlet.ServletResponse;
import java.io.Serializable;

/**
 * 自定义的sessionManager
 */
public class MySessionManager extends DefaultWebSessionManager {

    /**
     * 头信息中具有sessionId
     * 请求头：TOKEN： sessionId
     *
     * 指定sessionId的获取方式
     */
    protected Serializable getSessionId(ServletRequest request, ServletResponse response) {

        /** 获取请求头TOKEN中的数据 **/
        String sessionId = WebUtils.toHttp(request).getHeader("TOKEN");
        if(StringUtils.isEmpty(sessionId)) {
            /** 如果没有携带，生成新的sessionId  **/
            return super.getSessionId(request,response);
        }else{
            /** 返回sessionId **/
            request.setAttribute(ShiroHttpServletRequest.REFERENCED_SESSION_ID_SOURCE, "header");
            request.setAttribute(ShiroHttpServletRequest.REFERENCED_SESSION_ID, sessionId);
            request.setAttribute(ShiroHttpServletRequest.REFERENCED_SESSION_ID_IS_VALID, Boolean.TRUE);
            return sessionId;
        }
    }
}
